diff --git a/src/templates/duck.html b/src/templates/duck.html
index 80acd57..3a67276 100644
--- a/src/templates/duck.html
+++ b/src/templates/duck.html
@@ -4,6 +4,7 @@
   <img
     alt="mega spinney duck"
     src="{{ url_for('static', filename='photos/gifs/duck-spinning.gif') }}"
+    style="max-width: calc(100% - 2em);"
   />
   <h3>Stop disturbing the duck, can't you see he's busy spinning?</h3>
 </div>